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Abstract: The spot welding of aluminum alloy is a high nonlinear
multi-physical process. The contact resistance have both the random
distribution and high nonlinear variation characteristic. With the study
of the electric contact characteristic, a new numerical model of the
contact resistance is presented. Based on this new model, the initial
temperature field of the alumin-um alloy spot welding is simulated by
FEM. The result indicates that within the first quarter cycle the
temperature field is inhomogeneous severely and the electrode wears out
and the splashing mainly in this period. From the FEM result, it also
can be obtained that the nugget is formed during the first half cycle
mainly and it is hard to obviate the wear of the tip in spot welding of
aluminum alloy.
Key words: Aluminum alloy Spot welding Temperature field
CLC No: TG453
国家自然科学基金资助项目(50045019). Received 20010918, received in revised form 20020105
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